I felt like a little girl trying on her mom's bra with this one. It was HUGE in the cups, way, way too big for me. My guess is maybe a 32B would fit. I'm usually a 32D, occasionally a 32C. It was just comical how large the cups were. The band seemed about right.

Simone Perele Response: The Muse Contour Plunge runs about 1 cup size large in D – F cups. We recommend following Tomima’s Tip that D cups or larger should size down 1 cup size.
Rachel from New Mexico, USA